As several have pointed out, GMT is effectively the same as UTC.
If we're being really pedantic, there is a subtle difference involving
partial leap seconds, and the fact that the earth does not rotate at a
precisely constant rate. There is a very convenient and definitive
explanation of different time systems (including GMT, UTC, TAI, UT0,
UT1, UT2, and others) by Rick Fisher (KE8DH) of the National Radio
Astronomy Observatory at
http://www.cv.nrao.edu/~rfisher/Ephemerides/times.html .
73
Darrel, aa7fv.
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